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Timber Harvesting in South Africa—Past, Present, Future
Item type: Journal Article • Journal: South African Forestry Journal • Authors: P.W. Warkotsch --- Faculty of Forestry,After a short description of South African timber harvesting practices in the past, the present situation in terms of machine population and the current harvesting and extraction methods is discussed in more detail. -
Die invloed van grond-pH op die ekstraheerbare fosfor, kalium, kalsium en magnesium met bikarbonaat as ekstraheermiddel
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.J. Vorster --- , Republiek van Suid-Afrika P.J. Snyman --- , Republiek van Suid-AfrikaMet behulp van grond-pH is Olsen se natriumbikarbonaat- ekstraheerbare fosfor en ammoniumasetaat-ekstraheerbare kalium, kalsium en magnesium met die gewysigde ISFEI- (NH4HCO3 - Na-EDTA - NH4F) ekstraksiemetode vergelyk. Op grond van pH (CaCl2) is die grondmonsters wat in die ondersoek gebruik... -
Economical manual estimation of ammonium, nitrate and total inorganic nitrogen in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South Africa D.J. Laubscher --- Department of Soil Science, Republic of South AfricaColorimetrie methods for measurement of ammonium, nitrite and nitrate were modified (a) for application to small samples of nitrogen-poor soils, (b) by centrifugation of extracts to avoid contamination from filter papers and (c) to economize on apparatus and reagents. Estimates... -
Barley cultivar identification by acid Polyacrylamide gel electrophoresis of hordein proteins
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.T. de Villiers --- Department of Agronomy and Pastures, Republic of South Africa E.W. Laubscher --- Department of Agronomy and Pastures, Republic of South AfricaMethods are described for the extraction and separation of hordein proteins of barley by acid Polyacrylamide gel electrophoresis as a means of identifying different cultivars. Experimental conditions for the extraction of the proteins from single kernels and from corresponding flour... -
'n Vergelyking van verskillende metodes vir die ekstraksie en bepaling van aluminium in grond
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mardel Pretorius --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-Afrika D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaVier metodes vir die ekstrahering en bepaling van Al in suur gronde is vergelyk vir grondmonsters vanaf 'n verskeidenheid van bronne en met pH (KCl) waardes tussen 3,3 en 4,4. Die oogmerk was om 'n vinnige, eenvoudige, maar steeds betroubare... -
Recommended modifications to the spectrophotometric determination of molybdenum as Fe[MoO(SCN)5]
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. Bessinger --- , Republic of South AfricaThe classical method for the determination of molybdenum in plant material by the formation of an iron-molybdenum- thiocyanate complex, which is extracted with alcohols, ethers and carbon tetrachloride from a dilute acid solution, is basically very suitable for the detection... -
Wheat cultivar identification by electrophoretic analysis of gliadin proteins
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.T. de Villiers --- Department of Botany, Republic of South Africa M. Bosman --- Centre for Cereal Research, Department of Agronomy and Pastures, Republic of South AfricaPolyacrylamide gel electrophoresis of gliadin proteins in an acid medium was used to identify different spring wheat cultivars. Gliadins were extracted from single kernels or corresponding flour samples using different solvents. Gliadin electrophoretogram formulae using relative band mobilities and staining... -
Maize response to Langebaan rock phosphate—superphosphate mixtures under glasshouse conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.R. Thibaud --- Summer Grain Sub-Centre, Republic of South Africa M. P.W. Farina --- Summer Grain Sub-Centre, Republic of South Africa J.C. Hughes --- Department of Agronomy, Republic of South Africa M.A. Johnston --- Department of Agronomy, Republic of South AfricaA previous investigation showed that Langebaan rock phosphate (Langfos) was not an effective substitute for superphosphate. However, in the light of reports that P availability is enhanced when phosphate rock (PR) and monocalcium phosphate are combined, an improvement in Langfos... -
Comparison of protein extraction procedures to assess the effect of quantitative protein composition on the bread-making quality of South African winter wheat cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. van Lill --- Small Grain Centre, Republic of South Africa B.S. Wentzel --- Small Grain Centre, Republic of South Africa MarieF. Smith --- , Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South AfricaA suitable technique for the extraction of wheat flour protein fractions was pursued to assess the effect of quantitative protein composition on the bread-making quality of winter wheat cultivars on a large scale. Nine procedures involving the use of different... -
Identification of tall fescue grass cultivars by sodium dodecyl sulphate and acid polyacrylamide gel electrophoresis
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.E. Hierse --- , Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South Africa M. Bosman --- Department of Botany, Republic of South AfricaProtein banding patterns of seed obtained by sodium dodecyl sulphate Polyacrylamide gel electrophoresis (SDS-PAGE) or acid Polyacrylamide gel electrophoresis (A-PAGE) were used to distinguish between different tall fescue (Festuca arundinacea Shreb.) grass cultivars. An electrophoretic formula was determined for each... -
Soil water use and rooting depth of Italian ryegrass (Lolium multiflorum Lam.) in a small plot experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.E. Steynberg --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South Africa N. F.G. Rethman --- Department of Plant Production, Republic of South AfricaItalian ryegrass is planted mainly under irrigation in the summer rainfall region of South Africa. Irrigation practices are often based on the assumption that Italian ryegrass has an extremely shallow root system. A small plot experiment was conducted to ascertain... -
A comparison of methods used for the extraction of K in soils of the Western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.R. Thompson --- Department of Agricultural Development, Republic of South AfricaA number of common soil extractants, mainly those used for soil P, were used to extract K from a range of widely differing soils which occur in the Western Cape; the objective being to evaluate the simultaneous determination of P... -
Extraction and electrophoretic separation of proteins from leaves of scions and rootstocks of Vitis cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E.W. le Grange --- , Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South AfricaProteins were extracted and separated by SDS-PAGE from leaves of scions and rootstocks of different Vitis cultivars. Banding patterns were used to identify the different cultivars after extraction of the proteins with a medium containing Tris-HCI (0.68 M, pH 7.8),... -
Fosfor in geselekteerde onversteurde en bewerkte Suid-Afrikaanse gronde 1. Totale, anorganiese en organiese fosfor
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. van Zyl --- Departement Grondkunde, Republiek van Suid-Afrika C.C. du Preez --- Departement Grondkunde, Republiek van Suid-AfrikaMin is bekend oor die effek van boerderypraktyke soos bewerking, bemesting en bekalking op die fosforfraksies in gronde van die somerreënvalgebied (25°-30°S; 24°–30°O) in Suid-Afrika. Die doelstellings van die studie was om die effek van gewasverbouing op die totale (Pt),... -
Fosfor in geselekteerde onversteurde en bewerkte Suid-Afrikaanse gronde 2. Anorganiese en organiese fosforfraksies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. van Zyl --- Departement Grondkunde, Republiek van Suid-Afrika C.C. du Pree --- Departement Grondkunde, Republiek van Suid-AfrikaDaar is voorheen vasgestel dat gewasverbouing die anorganiese (Pa) en organiese (Po) fosforinhoud van gronde vanaf die somerreënvalgebied (25°-30° S; 24°-30° O) in Suid-Afrika beïnvloed het. Dus kan die Pa- en Po-fraksies, wat in planttoeganklikheid varieer, ook moontlik beïnvloed word... -
The use of acid Polyacrylamide gel electrophoresis to determine the effect of locality of growth on the protein profiles of barley, wheat and honeybush tea
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O.T. de Villiers --- Department of Botany, South Africa M. Bosman --- Centre for Cereal Research, Department of Agronomy and Pastures, South AfricaAcid Polyacrylamide gel electrophoresis (A-PAGE) of proteins was used to identify different spring wheat cultivare, barley cultivars and Cyclopia species. Experimental conditions for the extraction of the proteins from single kernels as well as corresponding flour samples are described. Different... -
Effects of aqueous extracts from Artemisia afra parts and soil on seed germination and early seedling development in selected plant species
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. Hansen-Quartey --- Department of Agronomy, Republic of South Africa K. Nyamapfene --- , Republic of South Africa S.A. Materechera --- School of Agriculture, Republic of South AfricaAqueous extracts from leaves, stems, roots of the aromatic shrub Artemisia afra and soil on which Artemisia was grown, were used to investigate their inhibitory effects on germination and seedling development of maize (Zea mays), bean (Phaseolus vulgaris) and ryegrass... -
An improved phosphorus desorption index for the routine determination of the Ambic 2 phosphorus requirement factor of South African soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.C. Henry --- , MarieF. Smith --- ,A short (24 h) laboratory incubation study was conducted and plots of P desorbed in Ambic 2 extraction solutions versus added P were constructed for a wide range of soils of varying P fixing capacity representative of the province of... -
Relationships between Ambic 1 and Bray 1 extractable phosphorus in some South African arable soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. J.J. Schmidt --- , South Africa F.G. Adriaanse --- , South Africa C.C. du Preez --- Department of Soil, South AfricaSouth African analytical laboratories use different extractants for P in soils of which the most important are Bray 1, Ambic 1, Bray 2, Truog and Olsen. The fertilizer industry prefers to use Bray 1 extractions for fertilization recommendations and the... -
Retention of applied phosphorus by the benchmark soils of Lesotho and quantification of their phosphorus retention indices
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.F. Molete --- Department of Soil, Crop and Climate Sciences, South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, South Africa M.V. Marake --- Faculty of Agriculture, LesothoThis study was conducted with the objective of determining and quantifying the capacity of Lesotho's benchmark soils to retain applied P. The soils were incubated with a range of P levels for a period of 42 days, whereafter P retention... -
Two-step approach to determining some useful phosphorus characteristics of South African soils: a review of work done at the ARC-Institute for Soil, Climate and Water
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.C. Henry --- , MarieF. Smith --- ,Work carried out at the ARC-Institute for Soil, Climate and Water on soil phosphorus characteristics was reviewed. Regression functions were established in order to test the correlations between P parameters, single point indices and soil properties. The parameters investigated were... -
Acidity/Al aspects in soils of the Lusikisiki area, Eastern Cape Province
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. Bühmann --- , D.J. Beukes --- , D.P. Turner --- ,Soil acidity related parameters like pH, extractable and soil organic matter bound Al, amorphous Al phases and Al substitutions in secondary iron minerals were determined on 57 samples from 15 representative soil profiles from the Lusikisiki area. The pH (H2O)... -
Extractable soil phosphorus threshold values for dryland maize on the South African Highveld
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. J.J. Schmidt --- , South Africa F.G. Adriaanse --- , South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaThe principle objective of this study was to establish P fertilizer guidelines for dryland maize on the South African Highveld according to the sufficiency concept of soil extractable P. Data sets from nine different P fertilizer trials at various localities... -
Anew optimum value for zinc in the main maize producing sandy soils of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Van Biljon --- , Republic of South Africa C.A. Wright --- , Republic of South Africa D.S. Fouche --- , Republic of South Africa A.D.P. Botha --- , Republic of South AfricaSouth African farmers commenced applying zinc (Zn) during the 1960s at a rate of approximately 2 kg Zn ha−1. Although good yields were produced and Zn levels increased in South African maize fields, a recent survey revealed that maize meal... -
TOXIN EXTRACTION FROM THE BLUE-GREEN ALGA MICROCYSTIS AERUGINOSA BY DIFFERENT EXTRACTION MEDIA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: A.J. van der Westhuizen --- Department of Botany, South Africa J.N. Eloff --- Department of Botany, South AfricaThe extractability of toxin from Microcystis aeruginosa isolate UV-006 by different extraction media such as O, 1N HC1, 2N CH3COOH, Triton X-100 and water at different pH levels was investigated. The best recovery of toxin was achieved with water at... -
Fish Collections Taken from a Small Agricultural Water Withdrawal Site on the Groot River, Gamtoos River System, South Africa
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J.A. Cambray --- , South AfricaPeriodic water releases from Beervlei Dam on the Groot River of the Gamtoos River System were planned to flush the riverine pools of brack water and replace the pools with better quality water which was used to flood irrigate lucerne... -
Soil characteristics under legume and non-legume tree canopies in signalgrass (Brachiaria decumbens) pastures
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jose CB Dubeux --- North Florida Research and Education Center, USA Mario de Andrade Lira --- Instituto Agronômico de Pernambuco (IPA), Brazil Mercia V Ferreira dos Santos --- Zootecnia, Brazil Jim Muir --- Borlaug Institute, South Africa Monica A da Silva --- Zootecnia, Brazil Vicente I Teixeira --- Zootecnia, Brazil Alexandre C Leão de Mello --- Zootecnia, BrazilTree canopies can change soil environments. Our study looked at soils 10%, 50%, 100% and 150% the distance from tree trunk to canopy edge of leguminous sabiá (Mimosa caesalpiniifolia Benth.) and espinheiro (Machaerium aculeatum Raddi) and non-legume cajueiro (Anacardium occidentale... -
Non-destructive sampling of juvenile abalone using epipodial tentacles and mucus: method and application
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Slabbert R Roodt-WildingGood-quality biological material is needed to obtain intact deoxyribonucleic acid (DNA) for use in molecular techniques such as the polymerase chain reaction (PCR). Non-destructive sampling protocols of juvenile abalone Haliotis midae (7–15 months old) were tested in order to collect... -
Simultaneous extraction of chitin and astaxanthin from waste of lobsters Jasus lalandii, and use of astaxanthin as an aquacultural feed additive
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Auerswald G GädeThis work investigates simple methods for simultaneous extraction of astaxanthin and chitin from industrial waste of the South African West Coast rock lobster Jasus lalandii. Removal of proteins from waste is the critical step to yield intact chitin and astaxanthin... -
The effect of Sirex noctilio infestation and fire damage on the chemical composition of South African-grown Pinus patula pulpwood
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M du Plessis NJ le Roux S Gardner-Lubbe JPJ Swart (Change Le to le) T RypstraThe infection and association between the wood wasp Sirex noctilio and the fungus Amylostereum areolatum is responsible for large-scale tree mortality in the Midlands of the KwaZulu-Natal province in South Africa. An exploratory investigation on the effect of the infestation... -
Productivity and cost analysis of semi-mechanised and mechanised systems on the Viphya forest plantations in Malawi
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Elisha Ngulube --- Forest Postgraduate Programme, Plant Sciences Complex, South Africa Michal Brink --- Forest Postgraduate Programme, Plant Sciences Complex, South Africa Paxie W Chirwa --- Forest Postgraduate Programme, Plant Sciences Complex, South AfricaAt least 200 000 m3 of timber is harvested annually using semi-mechanised harvesting systems on the Viphya forest plantations in Malawi. Although these systems have long been used on the Viphya, no investigation on their productivity has so far been... -
Baited remote underwater video system (BRUVs) survey of chondrichthyan diversity in False Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L De Vos --- Marine Research Institute, Department of Biological Sciences, South Africa RGA Watson --- Marine Research Institute, Department of Biological Sciences, South Africa A Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South Africa CG Attwood --- Marine Research Institute, Department of Biological Sciences, South AfricaGlobal declines in chondrichthyan populations necessitate evidence‑based planning for their conservation. False Bay, in south‑west South Africa, has a high diversity of marine biota, with Atlantic and Indian Ocean influences, but its chondrichthyan fauna is poorly described ecologically. False Bay... -
The influence of the wheat rhizosphere on phosphorus desorption kinetics in calcareous soils amended with municipal sewage sludge
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tahereh Raiesi --- Horticultural Science Research Institute, Iran Alireza Hosseinpur --- Department of Soil Science, College of Agriculture, Iran Bijan Moradi --- Horticultural Science Research Institute, IranPlant growth in arid environments is limited by phosphorus (P) availability because of the low concentration of P in the soil solution. In addition, soil processes in the rhizosphere affect the mineral nutrition of plants. Thus, greenhouse and laboratory experiments... -
Effect of moringa extract on the leaf anatomy and yield potential of tomato infected by Alternaria solani
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Culver Mvumi --- Department of Plant and Soil Science, South Africa Diana Marais --- Department of Plant and Soil Science, South Africa Elizabeth Ngadze --- Department of Crop Science, Zimbabwe Elsa S du Toit --- Department of Plant and Soil Science, South Africa Albert Tsindi --- Faculty of Agriculture, ZimbabweTomato is often exposed to hormones and diseases, among other factors, to which responses in leaf anatomy and yield are observed. This study evaluated responses in the leaf anatomy of Alternaria solani infected (IN) and non-infected (NIN) tomato (Solanum lycopersicum)... -
Sensitivity of Meloidogyne incognita second-stage juvenile hatch, motility and viability to pure cucurbitacins and cucurbitacin-containing phytonematicides
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zakheleni P Dube --- Green Biotechnologies Research Centre, South Africa Phatu W Mashela --- Green Biotechnologies Research Centre, South Africa Dirk de Waele --- Green Biotechnologies Research Centre, South AfricaPrevious claims suggested that pure active ingredients from botanicals were less effective in pest management than their fermented crude-extracts. The objective of this study was to compare the toxicity of pure (98%) cucurbitacin A and B on nematode bioactivities with... -
The attitudes of riparian communities to the presence of water hyacinth in the Wouri River Basin, Douala, Cameroon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SN Kenfack Voukeng --- Department of Zoology and Entomology, South Africa P Weyl --- Department of Zoology and Entomology, South Africa MP Hill --- Department of Zoology and Entomology, South Africa N Chi --- Watershed Task Group Coordinator (WTG), CameroonSince publication of the first record of Eichhornia crassipes in Cameroon in 1997, the weed has become highly invasive in the Wouri River Basin. Between June and September 2014, a socio-economic survey using participatory and qualitative methods was undertaken in... -
Hope in the debris of capitalist dys/utopia? Historical progress and the intricacies of everyday life in Lephalale
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Thembi Luckett --- Sociology Department, South AfricaIn 2015, the local municipality of Lephalale in the Limpopo province of South Africa heralded the town as “the new Johannesburg” and the “future hub of power generation in South Africa.” The growth of the town is based on the... -
Effects of Chromolaena odorata leaf extract on behaviour and haematology of Clarias gariepinus juveniles (Burchell, 1822)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Okoro --- Department of Fisheries and Aquaculture, Nigeria SC Iheanacho --- Department of Fisheries and Aquaculture, Nigeria J Nwakpa --- Department of Fisheries and Aquaculture, Nigeria K Eze --- Department of Fisheries and Aquaculture, NigeriaThe current study investigated the effect of Chromolaena odorata leaf extract on the behaviour and haematology of Clarias gariepinus juveniles. One hundred and fifty (150) juveniles of C. gariepinus (46.02 ± 1.20 g) were exposed to a range of concentrations... -
Psychotria microphylla induces oxidative stress and biochemical alterations in giant African land snail Achatina achatina (Linnaeus, 1758)
Item type: Journal Article • Journal: African Zoology • Authors: CI Atama --- Department of Zoology and Environmental Biology, Nigeria CF Anajemba --- Department of Zoology and Environmental Biology, Nigeria ION Aguzie --- Department of Zoology and Environmental Biology, Nigeria JC Madu --- Department of Zoology and Environmental Biology, Nigeria NI Ossai --- Department of Zoology and Environmental Biology, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, NigeriaPsychotria microphylla is an ichthyotoxic botanical used to stupefy fish prior to harvesting in aquatic systems. The current study investigated the effect of P. microphylla leaf extract on the oxidative stress and biochemical parameters of the giant African land snail,... -
Toward a strategic management perspective on local content in African extractives: MNC procurement strategies between local responsiveness and global integration
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Michael Wendelboe Hansen --- Center for Business and Development Studies, DenmarkLocal content requirements – i.e. government backed requirements that extractive MNCs must procure inputs locally – are fast becoming a major issue in MNC-host country bargaining in Africa. As a result of increasingly stringent local content requirements, extractive MNCs operating... -
Response of the barrier island coastal region of southwestern Nigeria to climate and non-climate forcing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: IB Danladi --- Department of Geological Engineering, Turkey M Gül --- Department of Geological Engineering, Turkey E Ateş --- Vocational School of Ayaş, TurkeyDespite threats emanating from the influence of climate and non-climate forcing on the barrier island coastal region of southwestern Nigeria, the extent of the coastal erosion is poorly understood. We report evidence of coastal erosion and sediment accumulation in the... -
Phosphorus extraction by selected methods in alkaline and calcareous soils after mono-ammonium phosphate application at different rates
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AE Venter --- , South Africa CC du Preez --- , South AfricaLittle research has been done on extractable phosphorus (P) in alkaline and calcareous irrigated soils of South Africa. This study aimed to quantify extractable P by selected methods in these soils after application of mono-ammonium phosphate (MAP) at different rates... -
A comparison of the results of phosphorus analyses of alkaline and calcareous soils amongst South African laboratories
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AE Venter --- , South Africa CC du Preez --- , South AfricaLarge areas of alkaline and calcareous soils are irrigated in South Africa. For these soils, proper fertilisation programs based on soil phoshorus (P) analyses are required. Little is known about P analyses of alkaline and calcareous soils. The study aimed... -
Early growth and development of maize on sandy soils fertilised with zinc sources at different application rates
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LF van Straaten --- , South Africa CF Wessels --- , South Africa GM Ceronio --- , South Africa CC du Preez --- , South AfricaThe grain yield and quality of maize is often negatively influenced by zinc (Zn) deficiencies during early growth and development. Application of Zn to soil is therefore a necessity, especially when it is sandy. Glasshouse experiments were carried out to... -
Wood extraction performance with a farm tractor in a mountainous region of Brazil: cycle time, productivity and costs of two different work crews
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rafael Oliveira Brown --- , Brazil Kauê Augusto Oliveira-Nascimento --- , Brazil Renato César Gonçalves Robert --- , Brazil Daniel DeArmond --- , BrazilHarvesting is a complex and expensive step within forestry operations. In mountainous terrain timber harvesting is complex due to the risks and limitations that the terrain imposes on traditional forms of wood extraction. The objective of this study was to... -
Impact of liming on extractable phosphorus, exchangeable base cations, and effective cation exchange capacity of eastern Free State soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: HJJ van Zyl --- University of the Free State, South Africa CC du Preez --- University of the Free State, South AfricaSoil acidity can adversely affect wheat production in the eastern Free State, South Africa. Liming of the soils is therefore essential. The aim of this study was to establish whether extractable phosphorus (P), exchangeable calcium (Ca), magnesium (Mg) and potassium... -
Bioprospecting for active compounds: impact of milling, extract fractions and freeze-drying on targeted terpene compounds of Helichrysum odoratissimum (L.) Sweet
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Neliswa A. Matrose --- Agricultural Research Council (ARC) Infruitec-Nietvoorbij, South Africa Zinash A. Belay --- Agricultural Research Council (ARC) Infruitec-Nietvoorbij, South Africa Obikeze Kenechukwu --- University of the Western Cape, South Africa Lucky Mokwena --- Stellenbosch University, South Africa Oluwafemi James Caleb --- Stellenbosch University, South AfricaThis study investigated the effect of processing and freeze-drying on targeted volatile compounds (terpenes) of Helichrysum odoratissimum (L.) Sweet. Air-dried plant material was processed to obtain: (i) roughly ground leaves and stems (RGMHO); (ii) finely ground leaves and stems (FGMHO);... -
Evaluating resistance drilling and NIR spectroscopy for quantifying wood quality of young eucalypts grown in Guangxi province in southern China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Y Cheng --- , China GM Downes --- , Australia C Johnsson --- , Sweden B Sundberg --- , Sweden RJ Arnold --- Research Institute for Fast-growing Trees, ChinaCost-effective, non-destructive means of estimating wood properties of eucalypts grown in Guangxi, China, were evaluated using near infrared (NIR) spectroscopy and resistance drilling. For this evaluation, wood samples for NIR analysis and resistance drill measurements were collected from 581 trees,... -
Colonial Infrastructure and its Post-Independence Afterlives in Peter Kimani’s Dance of the Jakaranda
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Felix Mutunga Ndaka --- University of Johannesburg, South AfricaPeter Kimani’s Dance of the Jakaranda (2017a) is constructed around two structures, the Kenya-Uganda Railway and the Jakaranda Hotel. In this article, I argue that the narration of these structures and their survival in independent Kenya enable a revisiting of... -
Are inorganic nitrogen concentrations in potassium chloride and saturated paste extracts of irrigated soils comparable?
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D Steenekamp --- University of the Free State, South Africa LD van Rensburg --- University of the Free State, South Africa JH Barnard --- University of the Free State, South Africa CC du Preez --- University of the Free State, South AfricaPrecision agriculture is gaining momentum in irrigation through the assessment of soil salinity variability, often facilitated by electromagnetic induction (EMI) sensors. This study aimed to evaluate whether saturated paste extracts (SATe) could serve as a substitute for the standard 2... -
The Extractive Industries Transparency Initiative (EITI): exploring global extractive firms’ interpretation of EITI initiatives in Ghana’s mining sector amidst institutional complexity
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Hevina S. Dashwood --- , Uwafiokun Idemudia --- , Bill Buenar Puplampu --- , Kernaghan Webb --- ,The Extractive Industries Transparency Initiative (EITI) is a global governance initiative that has the primary goal of promoting greater transparency and accountability concerning the use of royalties paid by global extractive firms to governments. Global extractive firms are largely supportive... -
A review of the factors affecting bark quality of black wattle (Acacia mearnsii De Wild.) in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: P Avadianund Bridglall --- University of KwaZulu-Natal, South Africa MD Laing --- University of KwaZulu-Natal, South Africa A Morris --- Institute for Commercial Forestry Research, University of KwaZulu-Natal, South Africa RJ Burgdorf --- Institute for Commercial Forestry Research, University of KwaZulu-Natal, South AfricaBlack wattle (Acacia mearnsii De Wild.) stands as a pivotal commercial tree species, spanning 82 000 ha of land in South Africa. The revenue stream, sourced the from timber (85%) and bark (15%) sales, is estimated at US$200 million annually... -
Making and remaking life under threat: fenceline communities in eMalahleni, Mpumalanga
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Zaakiyah Rabbaney --- University of the Western Cape, South AfricaIn fenceline communities alongside coal extraction operations in South Africa, residents experience extreme environmental, social and economic conditions that can be traced to the country’s extractivist economy and race-based capitalist logic that created informal settlements in abandoned landscapes to which...